1 /* 2 * Copyright (c) 1989, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * This code is derived from software contributed 6 * to Berkeley by John Heidemann of the UCLA Ficus project. 7 * 8 * Source: * @(#)i405_init.c 2.10 92/04/27 UCLA Ficus project 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the University of 21 * California, Berkeley and its contributors. 22 * 4. Neither the name of the University nor the names of its contributors 23 * may be used to endorse or promote products derived from this software 24 * without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36 * SUCH DAMAGE. 37 * 38 * @(#)vfs_init.c 8.3 (Berkeley) 1/4/94 39 * $Id: vfs_init.c,v 1.11 1995/08/28 09:18:55 julian Exp $ 40 */ 41 42 43 #include <sys/param.h> 44 #include <sys/systm.h> 45 #include <sys/kernel.h> 46 #include <sys/mount.h> 47 #include <sys/time.h> 48 #include <sys/vnode.h> 49 #include <sys/stat.h> 50 #include <sys/namei.h> 51 #include <sys/ucred.h> 52 #include <sys/buf.h> 53 #include <sys/errno.h> 54 #include <sys/malloc.h> 55 #include <sys/proc.h> 56 #include <vm/vm.h> 57 #include <sys/sysctl.h> 58 59 /* 60 * System initialization 61 */ 62 63 static void vfsinit __P((void *)); 64 SYSINIT(vfs, SI_SUB_VFS, SI_ORDER_FIRST, vfsinit, NULL) 65 66 /* 67 * Sigh, such primitive tools are these... 68 */ 69 #if 0 70 #define DODEBUG(A) A 71 #else 72 #define DODEBUG(A) 73 #endif 74 75 struct vfsconf void_vfsconf; 76 77 extern struct linker_set vfs_opv_descs_; 78 #define vfs_opv_descs ((struct vnodeopv_desc **)vfs_opv_descs_.ls_items) 79 80 extern struct linker_set vfs_set; 81 struct vfsops *vfssw[MOUNT_MAXTYPE + 1]; 82 struct vfsconf *vfsconf[MOUNT_MAXTYPE + 1]; 83 84 extern struct vnodeop_desc *vfs_op_descs[]; 85 /* and the operations they perform */ 86 /* 87 * This code doesn't work if the defn is **vnodop_defns with cc. 88 * The problem is because of the compiler sometimes putting in an 89 * extra level of indirection for arrays. It's an interesting 90 * "feature" of C. 91 */ 92 int vfs_opv_numops; 93 94 typedef int (*PFI)(); /* the standard Pointer to a Function returning an Int */ 95 96 /* 97 * A miscellaneous routine. 98 * A generic "default" routine that just returns an error. 99 */ 100 int 101 vn_default_error() 102 { 103 104 return (EOPNOTSUPP); 105 } 106 107 /* 108 * vfs_init.c 109 * 110 * Allocate and fill in operations vectors. 111 * 112 * An undocumented feature of this approach to defining operations is that 113 * there can be multiple entries in vfs_opv_descs for the same operations 114 * vector. This allows third parties to extend the set of operations 115 * supported by another layer in a binary compatibile way. For example, 116 * assume that NFS needed to be modified to support Ficus. NFS has an entry 117 * (probably nfs_vnopdeop_decls) declaring all the operations NFS supports by 118 * default. Ficus could add another entry (ficus_nfs_vnodeop_decl_entensions) 119 * listing those new operations Ficus adds to NFS, all without modifying the 120 * NFS code. (Of couse, the OTW NFS protocol still needs to be munged, but 121 * that is a(whole)nother story.) This is a feature. 122 */ 123 void 124 vfs_opv_init(struct vnodeopv_desc **them) 125 { 126 int i, j, k; 127 int (***opv_desc_vector_p)(); 128 int (**opv_desc_vector)(); 129 struct vnodeopv_entry_desc *opve_descp; 130 131 /* 132 * Allocate the dynamic vectors and fill them in. 133 */ 134 for (i=0; them[i]; i++) { 135 opv_desc_vector_p = them[i]->opv_desc_vector_p; 136 /* 137 * Allocate and init the vector, if it needs it. 138 * Also handle backwards compatibility. 139 */ 140 if (*opv_desc_vector_p == NULL) { 141 /* XXX - shouldn't be M_VNODE */ 142 MALLOC(*opv_desc_vector_p, PFI*, 143 vfs_opv_numops*sizeof(PFI), M_VNODE, M_WAITOK); 144 bzero (*opv_desc_vector_p, vfs_opv_numops*sizeof(PFI)); 145 DODEBUG(printf("vector at %x allocated\n", 146 opv_desc_vector_p)); 147 } 148 opv_desc_vector = *opv_desc_vector_p; 149 for (j=0; them[i]->opv_desc_ops[j].opve_op; j++) { 150 opve_descp = &(them[i]->opv_desc_ops[j]); 151 152 /* 153 * Sanity check: is this operation listed 154 * in the list of operations? We check this 155 * by seeing if its offest is zero. Since 156 * the default routine should always be listed 157 * first, it should be the only one with a zero 158 * offset. Any other operation with a zero 159 * offset is probably not listed in 160 * vfs_op_descs, and so is probably an error. 161 * 162 * A panic here means the layer programmer 163 * has committed the all-too common bug 164 * of adding a new operation to the layer's 165 * list of vnode operations but 166 * not adding the operation to the system-wide 167 * list of supported operations. 168 */ 169 if (opve_descp->opve_op->vdesc_offset == 0 && 170 opve_descp->opve_op->vdesc_offset != 171 VOFFSET(vop_default)) { 172 printf("operation %s not listed in %s.\n", 173 opve_descp->opve_op->vdesc_name, 174 "vfs_op_descs"); 175 panic ("vfs_opv_init: bad operation"); 176 } 177 /* 178 * Fill in this entry. 179 */ 180 opv_desc_vector[opve_descp->opve_op->vdesc_offset] = 181 opve_descp->opve_impl; 182 } 183 } 184 /* 185 * Finally, go back and replace unfilled routines 186 * with their default. (Sigh, an O(n^3) algorithm. I 187 * could make it better, but that'd be work, and n is small.) 188 */ 189 for (i = 0; them[i]; i++) { 190 opv_desc_vector = *(them[i]->opv_desc_vector_p); 191 /* 192 * Force every operations vector to have a default routine. 193 */ 194 if (opv_desc_vector[VOFFSET(vop_default)]==NULL) { 195 panic("vfs_opv_init: operation vector without default routine."); 196 } 197 for (k = 0; k<vfs_opv_numops; k++) 198 if (opv_desc_vector[k] == NULL) 199 opv_desc_vector[k] = 200 opv_desc_vector[VOFFSET(vop_default)]; 201 } 202 } 203 204 /* 205 * Initialize known vnode operations vectors. 206 */ 207 void 208 vfs_op_init() 209 { 210 int i; 211 212 DODEBUG(printf("Vnode_interface_init.\n")); 213 /* 214 * Set all vnode vectors to a well known value. 215 */ 216 for (i = 0; vfs_opv_descs[i]; i++) 217 *(vfs_opv_descs[i]->opv_desc_vector_p) = NULL; 218 /* 219 * Figure out how many ops there are by counting the table, 220 * and assign each its offset. 221 */ 222 for (vfs_opv_numops = 0, i = 0; vfs_op_descs[i]; i++) { 223 vfs_op_descs[i]->vdesc_offset = vfs_opv_numops; 224 vfs_opv_numops++; 225 } 226 DODEBUG(printf ("vfs_opv_numops=%d\n", vfs_opv_numops)); 227 } 228 229 /* 230 * Routines having to do with the management of the vnode table. 231 */ 232 extern struct vnodeops dead_vnodeops; 233 extern struct vnodeops spec_vnodeops; 234 extern void vclean(); 235 struct vattr va_null; 236 237 /* 238 * Initialize the vnode structures and initialize each file system type. 239 */ 240 /* ARGSUSED*/ 241 static void 242 vfsinit(udata) 243 void *udata; /* not used*/ 244 { 245 struct vfsops **vfsp; 246 struct vfsconf **vfc; 247 int i; 248 249 /* 250 * Initialize the VFS switch table 251 */ 252 for(i = 0; i < MOUNT_MAXTYPE + 1; i++) { 253 vfsconf[i] = &void_vfsconf; 254 } 255 256 vfc = (struct vfsconf **)vfs_set.ls_items; 257 while(*vfc) { 258 vfssw[(**vfc).vfc_index] = (**vfc).vfc_vfsops; 259 vfsconf[(**vfc).vfc_index] = *vfc; 260 vfc++; 261 } 262 263 /* 264 * Initialize the vnode table 265 */ 266 vntblinit(); 267 /* 268 * Initialize the vnode name cache 269 */ 270 nchinit(); 271 /* 272 * Build vnode operation vectors. 273 */ 274 vfs_op_init(); 275 vfs_opv_init(vfs_opv_descs); /* finish the job */ 276 /* 277 * Initialize each file system type. 278 */ 279 vattr_null(&va_null); 280 for (vfsp = &vfssw[0]; vfsp <= &vfssw[MOUNT_MAXTYPE]; vfsp++) { 281 if (*vfsp == NULL) 282 continue; 283 (*(*vfsp)->vfs_init)(); 284 } 285 } 286 287 /* 288 * kernel related system variables. 289 */ 290 int 291 fs_sysctl(name, namelen, oldp, oldlenp, newp, newlen, p) 292 int *name; 293 u_int namelen; 294 void *oldp; 295 size_t *oldlenp; 296 void *newp; 297 size_t newlen; 298 struct proc *p; 299 { 300 int i; 301 int error; 302 int buflen = *oldlenp; 303 caddr_t where = oldp, start = oldp; 304 305 switch (name[0]) { 306 case FS_VFSCONF: 307 if (namelen != 1) return ENOTDIR; 308 309 if (oldp == NULL) { 310 *oldlenp = (MOUNT_MAXTYPE+1) * sizeof(struct vfsconf); 311 return 0; 312 } 313 if (newp) { 314 return EINVAL; 315 } 316 317 for(i = 0; i < MOUNT_MAXTYPE + 1; i++) { 318 if(buflen < sizeof *vfsconf[i]) { 319 *oldlenp = where - start; 320 return ENOMEM; 321 } 322 323 error = copyout(vfsconf[i], where, sizeof *vfsconf[i]); 324 if(error) 325 return error; 326 where += sizeof *vfsconf[i]; 327 buflen -= sizeof *vfsconf[i]; 328 } 329 *oldlenp = where - start; 330 return 0; 331 332 default: 333 if(namelen < 1) return EINVAL; 334 335 i = name[0]; 336 337 if(i <= MOUNT_MAXTYPE 338 && vfssw[i] 339 && vfssw[i]->vfs_sysctl) { 340 return vfssw[i]->vfs_sysctl(name + 1, namelen - 1, 341 oldp, oldlenp, 342 newp, newlen, p); 343 } 344 345 return (EOPNOTSUPP); 346 } 347 /* NOTREACHED */ 348 } 349 350 /* 351 * This goop is here to support a loadable NFS module... grumble... 352 */ 353 void (*lease_check) __P((struct vnode *, struct proc *, struct ucred *, int)) 354 = 0; 355 void (*lease_updatetime) __P((int)) 356 = 0; 357 358